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Postgres integration with asyncio.

Project description

aiopg is a library for accessing a PostgreSQL database from the asyncio (PEP-3156/tulip) framework. It wraps asynchronous features of the Psycopg database driver.


import asyncio
from aiopg.pool import create_pool

dsn = 'dbname=jetty user=nick password=1234 host=localhost port=5432'

def test_select():
    pool = yield from create_pool(dsn)

    with (yield from pool) as conn:
        cur = yield from conn.cursor()
        yield from cur.execute('SELECT 1')
        ret = yield from cur.fetchone()
        assert ret == (1,), ret


Example of SQLAlchemy optional integration

import asyncio
from import create_engine
import sqlalchemy as sa

metadata = sa.MetaData()

tbl = sa.Table('tbl', metadata,
    sa.Column('id', sa.Integer, primary_key=True),
    sa.Column('val', sa.String(255)))

def go():
    engine = yield from create_engine(user='aiopg',

    with (yield from engine) as conn:
        yield from conn.execute(tbl.insert().values(val='abc'))

        res = yield from conn.execute(
        for row in res:
            print(, row.val)


Please use:

$ python3

for executing project’s unittests


0.8.0 (XXXX-XX-XX)

  • Add PostgreSQL notification support #58

  • Support pools with unlimited size #59

0.7.0 (2015-04-22)

  • Get rid of resource leak on connection failure.

  • Report ResourceWarning on non-closed connections.

  • Deprecate iteration protocol support in cursor and ResultProxy.

  • Release sa connection to pool on connection.close().

0.6.0 (2015-02-03)

  • Accept dict, list, tuple, named and positional parameters in SAConnection.execute()

0.5.2 (2014-12-08)

  • Minor release, fixes a bug that leaves connection in broken state after cursor.execute() failure.

0.5.1 (2014-10-31)

  • Fix a bug for processing transactions in line.

0.5.0 (2014-10-31)

  • Add .terminate() to Pool and Engine

  • Reimplement connection pool (now pool size cannot be greater than pool.maxsize)

  • Add .close() and .wait_closed() to Pool and Engine

  • Add minsize, maxsize, size and freesize properties to sa.Engine

  • Support echo parameter for logging executed SQL commands

  • Connection.close() is not a coroutine (but we keep backward compatibility).

0.4.1 (2014-10-02)

  • make cursor iterable

  • update docs

0.4.0 (2014-10-02)

  • add timeouts for database operations.

  • Autoregister psycopg2 support for json data type.

  • Support JSON in

  • Support ARRAY in

  • Autoregister hstore support if present in connected DB

  • Support HSTORE in

0.3.2 (2014-07-07)

  • change signature to cursor.execute(operation, parameters=None) to follow psycopg2 convention.

0.3.1 (2014-07-04)

  • Forward arguments to cursor constructor for pooled connections.

0.3.0 (2014-06-22)

  • Allow executing SQLAlchemy DDL statements.

  • Fix bug with race conditions on acquiring/releasing connections from pool.

0.2.3 (2014-06-12)

  • Fix bug in connection pool.

0.2.2 (2014-06-07)

  • Fix bug with passing parameters into SAConnection.execute when executing raw SQL expression.

0.2.1 (2014-05-08)

  • Close connection with invalid transaction status on returning to pool.

0.2.0 (2014-05-04)

  • Implemented optional support for sqlalchemy functional sql layer.

0.1.0 (2014-04-06)

  • Implemented plain connections: connect, Connection, Cursor.

  • Implemented database pools: create_pool and Pool.

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